EB73S-SB1240X Equivalent & Substitute Parts

Part Overview

The EB73S-SB1240X is a 24-position female card edge connector manufactured by Vishay Dale, designed for dual-edge applications with 0.156" (3.96mm) pitch spacing. This connector features gold-plated phosphor bronze contacts and is rated for operating temperatures from -55°C to 125°C. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Connector Type	Card Edge, Dual Female
Number of Positions	24
Pitch	0.156" (3.96mm)
Card Thickness Range	0.054" ~ 0.071" (1.37mm ~ 1.80mm)
Number of Rows	2
Gender	Female
Mounting Type	Through Hole
Termination	Solder
Contact Finish	Gold
Operating Temperature	-55°C ~ 125°C
Color	Black
Flange Feature	Flush Mount, Top Opening, Unthreaded, 0.128" (3.25mm) Dia

Substitute Part Grouping Explanation

Substitution of the EB73S-SB1240X is determined by strict alignment of the following critical parameters:

Connector Configuration: 24-position, dual-row, female card edge connector
Pitch Spacing: 0.156" (3.96mm) — mandatory for PCB edge slot compatibility
Card Thickness Tolerance: Acceptable range 0.054" ~ 0.071" (1.37mm ~ 1.80mm)
Contact Finish: Gold plating for corrosion resistance and signal integrity
Mounting and Termination: Through-hole solder termination
Flange Geometry: Flush mount, top opening configuration with 0.128" (3.25mm) diameter unthreaded hole

The substitute part 356-012-520-102 (Mercury United Electronics, Inc.) meets these core substitution criteria. Variations in contact material (copper alloy vs. phosphor bronze), contact type (cantilever vs. full bellows), and read-out configuration (dual vs. single) are within acceptable tolerance for functional equivalence in card edge connector applications.

Parameter Comparison

Parameter	EB73S-SB1240X (Vishay Dale)	356-012-520-102 (Mercury)	Compatibility
Number of Positions	24	24	Match
Pitch	0.156" (3.96mm)	0.156" (3.96mm)	Match
Card Thickness Range	0.054" ~ 0.071" (1.37mm ~ 1.80mm)	0.054" ~ 0.070" (1.37mm ~ 1.78mm)	Compatible
Number of Rows	2	2	Match
Gender	Female	Female	Match
Mounting Type	Through Hole	Through Hole	Match
Termination	Solder	Solder	Match
Contact Finish	Gold	Gold	Match
Color	Black	Black	Match
Flange Feature	Flush Mount, Top Opening, Unthreaded, 0.128" (3.25mm) Dia	Flush Mount, Top Opening, Unthreaded, 0.128" (3.25mm) Dia	Match
Operating Temperature	-55°C ~ 125°C	-40°C ~ 105°C	Substitute range narrower
Contact Material	Phosphor Bronze	Copper Alloy	Different material
Contact Type	Full Bellows	Cantilever	Different contact design
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute is compliant
Product Status	Obsolete	Active	Substitute is in production

Engineering Selection Recommendations

The 356-012-520-102 (Mercury United Electronics, Inc.) is the qualified substitute for the obsolete EB73S-SB1240X. Selection of this substitute is supported by the following factors:

Product Availability: The substitute is active in production with 781 units in stock, whereas the original part is obsolete.
Regulatory Compliance: The substitute meets ROHS3 compliance requirements, providing advantage for modern manufacturing and environmental standards.
Functional Equivalence: All critical connector parameters—position count, pitch, card thickness tolerance, mounting configuration, and termination method—are matched or compatible.
Operating Temperature Consideration: The substitute operates within -40°C to 105°C, which is narrower than the original -55°C to 125°C range. Applications requiring the full original temperature range must evaluate this limitation against system requirements.
Contact Design Variation: The substitute uses cantilever contacts instead of full bellows contacts. This represents a design variation within the card edge connector category and does not preclude functional substitution for standard applications.

Frequently Asked Questions (FAQ)

Q: Can the 356-012-520-102 be used as a direct replacement for the EB73S-SB1240X in existing designs?

A: Yes, for applications operating within -40°C to 105°C. The substitute matches all critical connector parameters: 24 positions, 0.156" pitch, dual-row configuration, female gender, through-hole solder termination, and flush-mount flange geometry. If your application requires operation below -40°C or above 105°C, the narrower temperature range of the substitute must be evaluated against system specifications.

Q: What is the difference between full bellows and cantilever contact types?

A: Both contact types are used in card edge connectors. Full bellows contacts provide a spring-like action with multiple contact points, while cantilever contacts use a single beam design. For standard card edge connector applications with typical insertion forces and signal frequencies, both designs provide adequate electrical and mechanical performance.

Q: Does the substitute's ROHS3 compliance affect compatibility?

A: No. ROHS3 compliance indicates the substitute meets environmental and regulatory standards for lead-free manufacturing. This is an advantage for new designs and does not create incompatibility with the original part's function or mechanical interface.

Q: Are there any packaging differences between the main part and substitute?

A: The original part (EB73S-SB1240X) packaging is not specified in the data. The substitute (356-012-520-102) is supplied in bulk packaging. Confirm packaging requirements for your procurement and assembly processes.

Q: What is the card thickness tolerance difference?

A: The original part accepts cards 0.054" ~ 0.071" (1.37mm ~ 1.80mm) thick. The substitute accepts 0.054" ~ 0.070" (1.37mm ~ 1.78mm). The substitute's upper tolerance is 0.001" (0.02mm) lower. For cards at the maximum thickness, verify compatibility with the substitute's tolerance range.

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